Number eight on the Philanthropy 50 for 2012 was Carl Icahn, a Wall Street Billionaire who claims that those who accumulate wealth have a responsibility to society to give back. His major donation beneficiary this year goes to the Mount Sinai School of Medicine in New York, which is now renamed the Icahn School of Medicine. The school also established the Icahn Genomics Institute for research on genetic testing, and created several scholarships in his name. It is the largest donation to a medical school ever recorded. To read more about Carl Icahn, head over to our profile.